I want to connect four 6-wire load cells (Tedea Huntleigh Compression & Tension Load Cell 300kg, 15V dc, IP67, product page and datasheet) into an Arduino or Raspberry Pi and get four independent readings. This is my first time dealing with load cells.
I would like to get an accuracy of 2kg and a range of 25-100 kg on each load cell. The load cells have a recommended excitation of 10V.
My understanding is that, to get a working prototype, I can:
- not use the two sense wires in the load cell (first suggestion by DaveEvans in this Arduino thread)
- use a breadboard, even though it's not meant for a sensitive circuit
- use the 5V supply from the Arduino, which halves the output voltage from the load cell but does not require an extra power supply or an booster converter, with some decrease in precision of the reading
- use an INA125P amplifier and the wiring in the first link of this thread and connect each load cell to a single analog pin in the Arduino Uno, which only has 5 analog pins
- calibrate the reading from each load cell with two known weights and extrapolate linearly
Would this work? Which shortcuts would be the first to consider to improve the precision of the readings?